If hydraulic fluid pressure increases inside the shuttle valve, which of the following will occur?

If hydraulic fluid pressure increases inside the shuttle valve, which of the following will occur?

• A. The valve bleeds to atmosphere
• B. The valve moves to the OFF position
• C. The valve opens to equalize pressure
• D. The valve seals and holds pressure

Answer: (B)

A shuttle valve automatically picks the higher-pressure input and blocks the other to feed the outlet. The moving piece inside shifts in response to the pressure difference: when one side’s pressure rises, it pushes the shuttle toward the opposite, sealing that side off. This leaves the higher-pressure path connected to the output while the lower-pressure side is turned OFF. So, as hydraulic pressure increases on one side, the valve converts that by moving the inlet with lower pressure to the OFF position, preventing flow from that side and delivering the higher pressure to the output.

A shuttle valve automatically picks the higher-pressure input and blocks the other to feed the outlet. The moving piece inside shifts in response to the pressure difference: when one side’s pressure rises, it pushes the shuttle toward the opposite, sealing that side off. This leaves the higher-pressure path connected to the output while the lower-pressure side is turned OFF. So, as hydraulic pressure increases on one side, the valve converts that by moving the inlet with lower pressure to the OFF position, preventing flow from that side and delivering the higher pressure to the output.